Is Decree of Silence legal in Standard, Modern, and Commander?

Decree of Silence is legal in: Legacy, Vintage, Commander.

Decree of Silence

Q: What type of card is Decree of Silence?

Decree of Silence is an Enchantment. Its oracle text reads: "Whenever an opponent casts a spell, counter that spell and put a depletion counter on this enchantment. If there are three or more depletion counters on this enchantment, sacrifice it. Cycling {4}{U}{U} ({4}{U}{U}, Discard this card: Draw a card.) When you cycle this card, you may counter target spell."

Enchantment

Whenever an opponent casts a spell, counter that spell and put a depletion counter on this enchantment. If there are three or more depletion counters on this enchantment, sacrifice it.

Cycling (, Discard this card: Draw a card.)